A kind of storage-stable platiniferous hydrosilylation catalyst and preparation method thereof
Technical field
The invention belongs to chemosynthesis technical field, and in particular to a kind of storage-stable platiniferous hydrosilylation catalyst and
Its preparation method.
Background technology
Hydrosilylation refers to what is carried out under certain condition with unsaturated compound by the silane compound of siliceous hydrogen
A kind of addition reaction, it is had a wide range of applications among organosilicon chemistry and consequence, since the reaction be found with
Come, in decades, experienced the development in faster several stages, reacted, arrived from the initial simple condition for using high temperature
Introduce the custom catalystses such as ultraviolet, peroxide, azo-compound afterwards to be catalyzed, until Speier discoveries, by chlorine platinum
Acid be dissolved in isopropanol can effective catalyzing addition reaction of silicon with hydrogen, platinum element is incorporated into hydrosilylation for the first time.This
Willing reacts chloroplatinic acid and silicone compounds containing unsaturated bond on the basis of the method that Speier is used afterwards, will be anti-
The compound that should be formed afterwards is used in hydrosilylation, can continue to improve the efficiency of Si―H addition reaction.Karstedt is in forefathers
On the basis of, Willing method is further improved, using chloroplatinic acid or chloroplatinate in ethanol with sodium acid carbonate and
Vinylsiloxane heating response, form the vinylsiloxane complex compound of platinum, such a catalyst for eliminating halogen, catalysis effect
For rate compared with the vinylsiloxane complex compound of chloroplatinic acid before, its catalytic efficiency has further raising, such a catalysis
Agent is still applied to organosilicon chemistry industrial many necks today as catalyst the most frequently used in hydrosilylation
Domain, although such a catalyst relatively before catalyst compare, have higher catalytic efficiency, there is also storage is unstable simultaneously
It is fixed, reaction easily is produced with the heavy metal ion in storage condition and other active compounds, it is unstable to form new high-valence state
Fixed platinum compounds, platinum black precipitation is ultimately formed, loses catalytic activity.Therefore, develop one kind can with industrialized production, and
Can just it be particularly important in the potential new catalyst containing the environment stored for extended periods that can make catalyst poisoning ion.
The content of the invention
To solve the shortcomings that prior art and weak point, primary and foremost purpose of the invention is to provide a kind of storage-stable
Platiniferous hydrosilylation catalyst.
Another object of the present invention is to provide the preparation method of above-mentioned storage-stable platiniferous hydrosilylation catalyst.
The object of the invention is achieved through the following technical solutions:
A kind of storage-stable platiniferous hydrosilylation catalyst, the catalyst pass through compound containing platinum and organosilicon containing double bond
Oxygen alkyl ligand reacts, and adding a certain amount of organic compound after formation metal platinum-organic complex is prepared;It is wherein described to have
Machine compound is the compound with structure shown in formula I:
N is 4~10 in formula, preferably 5~7, more preferably 5;R is the alkane chain of carbon number 1~17, preferably carbon atom
Number is 4 alkane chain.
A kind of preparation method of storage-stable platiniferous hydrosilylation catalyst, comprises the following steps:
(1) compound containing platinum, silicone compounds containing unsaturated bond and sodium acid carbonate are dissolved in organic solvent, Ran Hou
Reacted 1~8 hour in 50 DEG C~120 DEG C under stirring;
(2) organic compound of the structural formula as shown in formula I is added after thing to be mixed fully reacts, and keeps 50 DEG C~120
Stop heating and stirring, natural cooling after DEG C stirring reaction certain time;Wherein, the organic compound and compound containing platinum of addition
The ratio between the amount of material be 1:1~30:1;
(3) reaction solution is transferred out from container, then sodium acid carbonate separated from reaction solution;It will get rid of
Organic solvent in the reaction solution of sodium acid carbonate is separated, that is, obtains the concentration of storage-stable platiniferous hydrosilylation catalyst
Liquid, used using hydrosilylation catalyst can be worked as after vinyl silicone oil or organic solvent in certain ratio dilution.
Step (1) described compound containing platinum includes H2PtCl6、PtCl2、Pt(COD)2、Na2PtCl4、K2PtCl4In extremely
Few one kind.Preferably, using H2PtCl6With Pt (COD)2At least one of.
Step (1) described organic solvent can select dichloromethane, chloroform, dichloroethanes, acetonitrile, tetrahydrofuran,
At least one of conventional organic solvent such as N,N-dimethylformamide, DMAC N,N' dimethyl acetamide, 1-METHYLPYRROLIDONE.It is excellent
Selection of land, use at least one of chloroform or dichloromethane.
The ratio of the amount of the material of step (1) sodium acid carbonate and compound containing platinum is 1:1~8:1.
Silicone compounds containing unsaturated bond described in step (1) are tetramethyl divinyl disiloxane or tetramethyl tetrem
Alkenyl cyclotetrasiloxane.
The amount ratio of step (1) compound containing platinum and the material of the silicone compounds containing unsaturated bond is 1:2~1:
10, preferably 1:4.
Step (1) heat time is preferably 3 hours, and heating-up temperature is preferably 70 DEG C~90 DEG C.
The structural formula of step (2) described organic compound is as shown in formula I;The chemical constitution of the organic compound is preferably
N is equal to 5, R C4H9。
The time of step (2) described stirring reaction is 15~100 minutes, preferably 30 minutes.
The ratio between amount of material of step (2) organic compound and compound containing platinum is preferably 4:1~16:1, more preferably
For 12:1.
Compared with prior art, the present invention has advantages below and beneficial effect:
Storage-stable platiniferous hydrosilylation catalyst provided by the invention, solves existing platiniferous Si―H addition reaction catalysis
Agent storage is unstable, is easily reacted with metal ion and other active compounds, the problem of losing catalytic activity.
Embodiment
With reference to embodiment, the present invention is described in further detail, but the implementation of the present invention is not limited to this.
Embodiment 1
1g chloroplatinic acids, 2g tetramethyl divinyl disiloxanes, 0.4g sodium acid carbonate and 30mL chloroform are added
Enter into 50mL two mouthfuls of flasks, 80 DEG C of agitating and heatings are reacted 2 hours;Then add n in structural formula shown in 28g formulas I and be equal to 5, R
Equal to C4H9Organic compound, kept for 80 DEG C, continue heating stirring 30 minutes, after stopping reaction, question response liquid natural cooling
Afterwards, the sodium acid carbonate in reaction solution is filtered out using filter paper.Chloroform in filtrate is separated using the mode of vacuum distillation
Go out, obtain the concentrate of catalyst, concentrate is diluted to finite concentration using toluene, you can as hydrosilylation catalyst
Use.
Embodiment 2
By 1g chloroplatinic acids, 4g tetramethyl divinyl disiloxane, 0.8g sodium acid carbonate and 30mL dichloromethane
It is added in 50mL two mouthfuls of flasks, 60 DEG C of agitating and heatings are reacted 3 hours;Then n in structural formula shown in 30g formulas I is added to be equal to
6th, R C3H7Organic compound, keep 60 DEG C continue react 30min, stop reaction after, after question response liquid natural cooling, use
The method of centrifugation separates the sodium acid carbonate in reaction solution.It is using the method for vacuum distillation that the dichloromethane in reaction solution is whole
Separate, obtain the concentrate of catalyst, concentrate is diluted to finite concentration using vinyl silicone oil, you can as silicon hydrogen
Addition catalyst uses.
Embodiment 3
By 1g Pt (COD)2, 4g t etram-ethyltetravinylcyclotetrasiloxane, 1g sodium carbonate and 30mL chloroform
It is added in 50mL two mouthfuls of flasks, 70 DEG C of agitating and heatings are reacted 3 hours;Then n in structural formula shown in 27g formulas I is added to be equal to
5th, R is equal to CH3Organic compound, kept for 70 DEG C continue heating stirring 15 minutes, after stopping reaction, question response liquid natural cooling
Afterwards, the sodium acid carbonate in reaction solution is filtered out using filter paper.It is using the method for vacuum distillation that the chloroform in mixed liquor is complete
Portion separates, and obtains the concentrate of catalyst, concentrate is diluted into finite concentration using vinyl silicone oil, you can as silicon
Hydrogen addition catalyst uses.
Embodiment 4
By 1g chloroplatinic acids, 4g tetramethyl divinyl disiloxane, 0.6g sodium acid carbonate and 30mL dichloromethane
It is added in 50mL two mouthfuls of flasks, 80 DEG C of agitating and heatings are reacted 4 hours;Then n in structural formula shown in 35g formulas I is added to be equal to
7th, R is equal to CH3Organic compound, kept for 80 DEG C continue heating stirrings and reacted 25 minutes, after stopping reaction, question response liquid is natural
After cooling, the sodium acid carbonate in reaction solution is isolated using the method for centrifugation.Using the method for vacuum distillation by mixed liquor
Dichloromethane is totally separated out, obtains the concentrate of catalyst, and concentrate is diluted into finite concentration using toluene, you can is made
Used for hydrosilylation catalyst.
The catalyst that will be prepared in embodiment 1-4, it is added to the silicone oil that hydrogen content is 1% and the second that double bond content is 2%
In alkenyl silicone oil, the hardening time under test different temperatures, under the same conditions, same amount of catalyst, embodiment 1-4 are added
The hardening time of the catalyst of preparation is basically identical, it was demonstrated that catalytic activity does not have compared with traditional Karstedt catalyst
Obvious to reduce, specific data are as shown in table 1 to table 4:
The hardening time of catalyst prepared by the embodiment 1-4 of table 1 and traditional Karstedt catalyst
The hardening time of catalyst prepared by the embodiment 1-4 of table 2 and traditional Karstedt catalyst
The hardening time of catalyst prepared by the embodiment 1-4 of table 3 and traditional Karstedt catalyst
The hardening time of catalyst prepared by the embodiment 1-4 of table 4 and traditional Karstedt catalyst
The catalyst prepared in embodiment 1-4 and Karstedt catalyst are used to the percentage by weight 1% of vinyl
Vinyl silicone oil be diluted to 3000ppm, place in a reservoir, add the 30ppm compound for easily making catalyst poisoning, see
Examine storage time, platinum black occur in catalyst is defined, it is possible to find, embodiment 1-4 catalyst under the same conditions, storage it is steady
Fix time and be considerably longer than Karstedt catalyst, it is specific as shown in table 5.
The storage time of catalyst prepared by the embodiment 1-4 of table 5 and traditional Karstedt catalyst
|
Karstedt |
Embodiment 1 |
Embodiment 2 |
Embodiment 3 |
Embodiment 4 |
Iron chloride |
3 days |
> 30 days |
> 30 days |
> 30 days |
> 30 days |
Copper chloride |
5 days |
> 30 days |
> 30 days |
> 30 days |
> 30 days |
Stannic chloride |
1 day |
15 days |
16 days |
20 days |
20 days |
Stearylmercaptan |
1 day |
8 days |
8 days |
16 days |
20 days |
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.